This is the wrong test for the cited ticket. That one is for tests
occurring in bracketed character classes.
/^\p{L}/ \x{3400} y $& \x{3400}
# RT #89774
-/s\xDF/ui \xDFs yT $& \xDFs
+/[s\xDF]/ui \xDFs ybT $& \xDFs
# RT #99928
/^\R\x0A$/ \x0D\x0A n - -
/[[:lower:]]/i \x{100} y $& \x{100}
/[[:upper:]]/i \x{101} y $& \x{101}
+# Was matching 'ss' only and failing the entire match, not seeing the
+# alternative that would succeed
+/s\xDF/ui \xDFs yT $& \xDFs
+
# vim: softtabstop=0 noexpandtab